They’re both vying to fill the vacant seat left by the late Sen. Frank Lautenberg (D-N.J.).

Christie explained he’ll be gone the day of the rally through that Sunday night because he’ll be away, celebrating with Mary Pat.

Both Christie and Paul are potential 2016 candidates for the GOP presidential ticket. Christie has surfaced in polls as the most viable choice for Republicans.

In late July, a fierce argument erupted between the two over several policy issues. Christie accused Paul of not caring for people affected by Hurricane Sandy, and Paul called Christie the “king of bacon.”

The two are expected to cross paths again on Sept. 23 when they’re slated to headline a Republican National Committee fundraiser in New York, along with other possible GOP presidential hopefuls.